You have two or three good choices. Saito .91/ Saito .72 on 30% fuel or The new OS .70 Ultimate. I have the .72 on mine. For great verticle authority it needs a 14x4W APC prop and 30% heli fuel. It will hover on a 13x4W and 15%, but it takes 3/4-7/8 throttle. The new OS would be great. The problem is it's $40 higher than a Saito .91.
David